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Event ID 30905: The client cannot connect to the server due to a multichannel constraint registry setting

Windows Event ID Lookup: What Windows event IDs mean: 4625, 4624, 4740, 6008, 41, 7045, 1102 and 3,000 more, with Windows' own message text, the fields and what to check.

Look up a Windows event ID from Event Viewer, a SIEM alert or a log export: what it means, the fields it records, and what to check. Many IDs are used by more than one source (event 41 is both a Kernel-Power crash and a boot error), so every definition is shown, the one people usually mean first. The message text is Windows' own, read from the event providers of Windows 10.0.26200.0, 2026-10-28; the notes are ours, based on Microsoft's security auditing reference.

Try: 4625, 4624, 4740, 6008, 41, 1074, 7045, 1102, 4104, 1149

The client cannot connect to the server due to a multichannel constraint registry setting.

Event 30905
SMBClient
SMBClient/Connectivity log
Error
Message and fields (as Event Viewer shows them) 
The client cannot connect to the server due to a multichannel constraint registry setting.

Server name: …

Guidance:
The client attempted to use SMB Multichannel, but an administrator has configured multichannel support to prevent multichannel on the client. You can configure SMB Multichannel on the client using the Windows PowerShell cmdlets: New-SmbMultichannelConstraint and Remove-SmbMultichannelConstraint.